@[Tryst](/user/616733) 把`del`那里改成：
```
s[a[x]]--;
cnt-=s[a[x]^k];
```
by xudongyi1 @ 2023-12-03 18:08:42
@[Tryst](/user/616733) 莫队指针要先扩展再缩小
by diqiuyi @ 2023-12-03 18:09:52
@[xudongyi1](/user/664034) @[diqiuyi](/user/324666) 感谢
by Tryst @ 2023-12-03 19:59:51
@[diqiuyi](/user/324666) thx
by zyh0516_lucky @ 2024-03-26 01:11:46